diff --git a/pkgs/development/python-modules/numpy/default.nix b/pkgs/development/python-modules/numpy/default.nix
index f3d8dcba31d..4a062ca7b97 100644
--- a/pkgs/development/python-modules/numpy/default.nix
+++ b/pkgs/development/python-modules/numpy/default.nix
@@ -19,7 +19,7 @@ let
     name = "site.cfg";
     text = (lib.generators.toINI {} {
       ${blas.implementation} = {
-        include_dirs = "${blas}/include:${lapack}/include";
+        include_dirs = "${lib.getDev blas}/include:${lib.getDev lapack}/include";
         library_dirs = "${blas}/lib:${lapack}/lib";
         libraries = "lapack,lapacke,blas,cblas";
       };